[@GoreLore]

It's to do with the status quo, as I said. Such public roleplays, while they may be called 'romantic' (I call them 'sexual'), will typically result in there being very little leeway for spontaneity or freedom of action. A kind of railroading if you please, that primarily supports players with their heads up their butts who only want the plot to progress in a way favorable to them and their relationships. You have people crying at the least little unaccounted disturbance, realistic or not, and it makes for a very boring experience unless you have a boner 24/7. 

Usually these players are the kinds of folks who worship social media and, as a result, have no taste for anything outside their own realm of experience. One-dimensional, like a Disney sitcom. 
I'm not saying romance is bad in roleplay, there just needs to be freedom and variety. It's like music. More people like the Jonas Brothers than Led Zeppelin today, but anyone with a lick of common sense knows which band kicks more ass. Some folks just listen to good music and lose their socially constructed boner because it doesn't fit within their personal paradigm.
They reside within a teeny comfort control bubble and anything that isn't bloody mundane is met by a REEEE!!
Hardly any tolerance, if any.

Ain't sayin' pop is bad either, but rather than having the Jonas Brothers OR Led Zeppelin forced on me, I'd want a roleplay that permits both in equal measure depending on the the roleplayers involved and what they like. In life shit happens, and not everything is always within your control. Especially not the actions of others.

The VAST majority of 'Mature' roleplays I see are the exact opposite, and those propagating them seem to miss the irony of it. You should always have a choice, but you shouldn't always have total control and peace outside of your own head.
Many 'sexual orientation' roleplays, in a manner of speaking, accept only Jonas Brothers music and whine when you get the Led out.